How does SLR shoot moving objects?

When shooting a high-speed moving object, you should choose different shutter speeds according to the moving speed of the object:

For example, if a person runs across the front at a medium speed, the shutter must be at least1125 seconds to ensure the clarity of the character; If it is a medium-speed car, the shutter speed should be at least 1/500 seconds. You can consider using the shutter first when shooting, and you don't need to set the aperture. If you want to set your own aperture, you should look at the light situation and the reflectivity of the subject at that time, and then set it according to the specific situation. As for the setting of sensitivity, you can consider the light conditions at that time and use the lowest sensitivity you can (basically at any time, because the lower the sensitivity, the lower the graininess).